{"id":1100,"date":"2013-09-13T16:27:29","date_gmt":"2013-09-13T15:27:29","guid":{"rendered":"http:\/\/www.phillips321.co.uk\/?p=1100"},"modified":"2013-09-13T16:36:06","modified_gmt":"2013-09-13T15:36:06","slug":"canyoufindit","status":"publish","type":"post","link":"https:\/\/www.phillips321.co.uk\/2013\/09\/13\/canyoufindit\/","title":{"rendered":"canyoufindit.co.uk – GCHQ Code Spoiler Alert!"},"content":{"rendered":"

So GCHQ have just released a new competition that’s fun to do in downtime. It’s hosted here: https:\/\/canyoufindit.co.uk<\/a>.<\/p>\n

It give’s you the following cipher and no information about it:
\n\"Screen<\/a><\/p>\n

After looking at the code it seems that the letter Q is very common. I tried various tricks such as applying ROT13 ROTn and so on but couldn’t get it to reveal anything clear.<\/p>\n

I then tried to take every x letter and when i got to 10 I was about to give up. I decided to go a little further and at a number a little higher than 10 I figured out the code was based on a rotational design. I haven’t a clue what it’s called but i guess this works in a similar way to a cipher stick<\/a>?
\n\"Skytale\"<\/a><\/p>\n

Well here’s the code for those that want the answer but I suggest figuring it out yourselves (p.s. This has been modified from my original version in order to pretty’fy things)…<\/p>\n

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<\/div><\/td>
#!\/usr\/bin\/env python<\/span>
\n# canyoufindit.co.uk part 1<\/span>
\nimport<\/span> sys<\/span>
\nprint<\/span> "[+] Origional cipher:"<\/span>
\ncipher=<\/span>"""AWVLI QIQVT QOSQO ELGCV IIQWD LCUQE EOENN WWOAO
\nLTDNU QTGAW TSMDO QTLAO QSDCH PQQIQ DQQTQ OOTUD
\nBNIQH BHHTD UTEET FDUEA UMORE SQEQE MLTME TIREC
\nLICAI QATUN QRALT ENEIN RKG"""<\/span>
\nprint<\/span> cipher
\n
\nprint<\/span> "\\n<\/span>[+] No spaces or newlines:"<\/span>
\ncipher=<\/span>cipher.replace<\/span>(<\/span>' '<\/span>,<\/span>''<\/span>)<\/span>.replace<\/span>(<\/span>'\\n<\/span>'<\/span>,<\/span>''<\/span>)<\/span>
\nprint<\/span> cipher
\n
\nprint<\/span> "\\n<\/span>[+] Swap Q for ' ':"<\/span>
\ncipher=<\/span>cipher.replace<\/span>(<\/span>'Q'<\/span>,<\/span>' '<\/span>)<\/span>
\nprint<\/span> cipher
\n
\nclear=<\/span>""<\/span>
\n
\nrotation=<\/span>13<\/span>
\nfor<\/span> i in<\/span> range<\/span>(<\/span>rotation)<\/span>:
\n    for<\/span> pos in<\/span> range<\/span>(<\/span>len<\/span>(<\/span>cipher)<\/span>)<\/span>:
\n        if<\/span> pos % rotation ==<\/span> i:
\n            clear+=<\/span>cipher[<\/span>pos]<\/span>
\n
\nprint<\/span> ""<\/span>
\nprint<\/span> clear.replace<\/span>(<\/span>'DOT'<\/span>,<\/span>'.'<\/span>)<\/span>.replace<\/span>(<\/span>'SLASH'<\/span>,<\/span>'\/'<\/span>)<\/span><\/div><\/td><\/tr><\/tbody><\/table><\/div>\n","protected":false},"excerpt":{"rendered":"

So GCHQ have just released a new competition that’s fun to do in downtime. It’s hosted here: https:\/\/canyoufindit.co.uk. It give’s you the following cipher and no information about it: After looking at the code it seems that the letter Q is very common. I tried various tricks such as applying ROT13 ROTn and so on […]<\/p>\n","protected":false},"author":1,"featured_media":1102,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/posts\/1100"}],"collection":[{"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/comments?post=1100"}],"version-history":[{"count":2,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/posts\/1100\/revisions"}],"predecessor-version":[{"id":1105,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/posts\/1100\/revisions\/1105"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/media\/1102"}],"wp:attachment":[{"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/media?parent=1100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/categories?post=1100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/tags?post=1100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}